diff --git a/theme/icon.go b/theme/icon.go
new file mode 100644
index 0000000..586d7de
--- /dev/null
+++ b/theme/icon.go
@@ -0,0 +1,288 @@
+package theme
+
+import "image"
+
+// IconSize represents the size of an icon.
+type IconSize int; const (
+	IconSizeSmall IconSize = iota;
+	IconSizeMedium
+	IconSizeLarge
+)
+
+// Icon represents an icon ID.
+type Icon int; const (
+	// --- Objects --- //
+
+	// files
+	IconFile Icon = iota
+	IconDirectory
+	IconDirectoryFull
+	
+	// places
+	IconDownloads
+	IconPhotos
+	IconBooks
+	IconDocuments
+	IconRepositories
+	IconMusic
+	IconArchives
+	IconFonts
+	IconBinaries
+	IconVideos
+	Icon3DObjects
+	IconHistory
+	IconPreferences
+	
+	// storage
+	IconStorage // generic
+	IconMagneticTape
+	IconFloppyDisk
+	IconHardDisk
+	IconSolidStateDrive
+	IconFlashDrive
+	IconMemoryCard
+	IconROMDisk
+	IconRAMDisk
+	IconCD
+	IconDVD
+	
+	// network
+	IconNetwork // generic
+	IconLocalNetwork
+	IconInternet
+	IconEthernet
+	IconWireless
+	IconCell
+	IconBluetooth
+	IconRadio
+	
+	// devices
+	IconDevice // generic
+	IconRouter
+	IconServer
+	IconDesktop
+	IconLaptop
+	IconTablet
+	IconPhone
+	IconWatch
+	IconCamera
+	
+	// peripherals
+	IconPeripheral // generic
+	IconKeyboard
+	IconMouse
+	IconMonitor
+	IconWebcam
+	IconMicrophone
+	IconSpeaker
+	IconPenTablet
+	IconTrackpad
+	IconController
+	
+	// i/o
+	IconPort // generic
+	IconEthernetPort
+	IconUSBPort
+	IconParallelPort
+	IconSerialPort
+	IconPS2Port
+	IconDisplayConnector
+	IconCGAPort
+	IconVGAPort
+	IconHDMIPort
+	IconDisplayPort
+	IconInfrared
+	
+	// --- Actions --- //
+	
+	// files
+	IconOpen
+	IconOpenIn
+	IconSave
+	IconSaveAs
+	IconPrints
+	IconNew
+	IconNewDirectory
+	IconDelete
+	IconRename
+	IconGetInformation
+	IconChangePermissions
+	IconRevert
+	
+	// list management
+	IconAdd
+	IconRemove
+	IconAddBookmark
+	IconRemoveBookmark
+	IconAddFavorite
+	IconRemoveFavorite
+	
+	// media
+	IconPlay
+	IconPause
+	IconStop
+	IconFastForward
+	IconRewind
+	IconToBeginning
+	IconToEnd
+	IconRecord
+	IconVolumeUp
+	IconVolumeDown
+	IconMute
+	
+	// editing
+	IconUndo
+	IconRedo
+	IconHistory
+	IconCut
+	IconCopy
+	IconPaste
+	IconFind
+	IconReplace
+	IconSelectAll
+	IconSelectNone
+	IconIncrement
+	IconDecrement
+	
+	// window management	
+	IconClose
+	IconQuit
+	IconIconify
+	IconShade
+	IconMaximize
+	IconFullScreen
+	IconRestore
+
+	// view controls
+	IconExpand
+	IconContract
+	IconBack
+	IconForward
+	IconUp
+	IconDown
+	IconReload
+	IconZoomIn
+	IconZoomOut
+	IconZoomReset
+	IconMove
+	IconResize
+	IconGoTo
+	
+	// tools
+	IconTransform
+	IconTranslate
+	IconRotate
+	IconScale
+	IconWarp
+	IconCornerPin
+	IconSelectRectangle
+	IconSelectEllipse
+	IconSelectLasso
+	IconSelectGeometric
+	IconSelectAuto
+	IconCrop
+	IconFill
+	IconGradient
+	IconPencil
+	IconBrush
+	IconEraser
+	IconText
+	IconEyedropper
+	
+	// --- Status --- //
+	
+	// dialogs
+	IconInformation
+	IconQuestion
+	IconWarning
+	IconError
+	IconCancel
+	IconOkay
+	
+	// network
+	IconCellSignal0
+	IconCellSignal1
+	IconCellSignal2
+	IconCellSignal3
+	IconWirelessSignal0
+	IconWirelessSignal1
+	IconWirelessSignal2
+	IconWirelessSignal3
+	
+	// power
+	IconBattery0
+	IconBattery1
+	IconBattery2
+	IconBattery3
+	IconBrightness0
+	IconBrightness1
+	IconBrightness2
+	IconBrightness3
+	
+	// media
+	IconVolume0
+	IconVolume1
+	IconVolume2
+	IconVolume3
+)
+
+// Icon returns an image of the corresponding icon ID.
+func (id Icon) Image (size IconSize) image.Image {
+	if current == nil { return image.Rect(0, 0, 16, 16) }
+	return current.Icon(id, size)
+}
+
+// MimeIcon returns an icon corresponding to a MIME type. This must
+// always return a non-nil value.
+func MimeIcon (mime data.Mime, size IconSize) image.Image {
+	if current == nil { return image.Rect(0, 0, 16, 16) }
+	return current.MimeIcon(mime, size)
+}
+
+// ApplicationIcon describes the icon of the application.
+type ApplicationIcon struct {
+	// The name or ID of the application. If applicable, this should
+	// correspond to the file name (without the path or extension) of the
+	// icon on the system. This field is optional.
+	Name string
+	
+	// Role describes what the application does. If a specific icon file
+	// cannot be found, a generic one is picked using this field.
+	Role ApplicationRole
+}
+
+// ApplicationRole describes what an application does.
+type ApplicationRole struct {
+	RoleUnknown ApplicationRole = iota
+
+	RoleWebBrowser
+	RoleMesssanger
+	RolePhone
+	RoleMail
+
+	RoleTerminalEmulator
+	RoleFileBrowser
+	RoleTextEditor
+
+	RoleDocumentViewer
+	RoleWordProcessor
+	RoleSpreadsheet
+	RoleSlideshow
+	RoleCalculator
+
+	RolePreferences
+	RoleProcessManager
+	RoleSystemInformation
+	RoleManual
+	
+	RoleCamera
+	RoleImageViewer
+	RoleMediaPlayer
+	RoleImageEditor
+	RoleAudioEditor
+	RoleVideoEditor
+
+	RoleClock
+	RoleCalendar
+	RoleChecklist
+}
diff --git a/theme/theme.go b/theme/theme.go
index f03161e..f8c25fe 100644
--- a/theme/theme.go
+++ b/theme/theme.go
@@ -52,6 +52,18 @@ type Theme interface {
 	
 	// RGBA returns the RGBA values of the corresponding color ID.
 	RGBA (Color) (r, g, b, a uint32)
+	
+	// Icon returns an image of the corresponding icon ID. This must always
+	// return a non-nil value. 
+	Icon (Icon, IconSize) image.Image
+	
+	// MimeIcon returns an icon corresponding to a MIME type. This must
+	// always return a non-nil value.
+	MimeIcon (data.Mime, IconSize) image.Image
+	
+	// ApplicationIcon returns an icon corresponding to an application. This
+	// must always return a non-nil value.
+	ApplicationIcon (ApplicationIcon, IconSize) image.Image
 }
 
 var current Theme