Try
RoundedCorners, a quick script that shows four images in the corners of the screen.
Download the four images and save them as 1.gif, 2.gif, 3.gif and 4.gif in the same folder as the script.
Skrommel
;RoundedCorners.ahk
;Skrommel @ 2009
#NoEnv
#SingleInstance,Force
SetWorkingDir %A_ScriptDir%
SetWinDelay,0
SetBatchLines,-1
Gui,Color,FFFFFF
Gui,+AlwaysOnTop +TopMost -Caption +E0x20 +Border +ToolWindow
x=0
y=0
Gui,Add,Picture,x%x% y%y%,1.gif
x:=A_ScreenWidth-37
y=0
Gui,Add,Picture,x%x% y%y%,2.gif
x:=A_ScreenWidth-37
y:=A_ScreenHeight-37
Gui,Add,Picture,x%x% y%y%,3.gif
x=0
y:=A_ScreenHeight-37
Gui,Add,Picture,x%x% y%y%,4.gif
Gui,+LastFound
guiid:=WinExist()
Gui,Show,x0 y0 w%A_ScreenWidth% h%A_ScreenHeight% NoActivate
WinSet,TransColor,FFFFFF,ahk_id %guiid%
WinSet,AlwaysOnTop,On,ahk_id %guiid%
SetTimer,TOP,1000
Return
TOP:
WinSet,Top,,ahk_id %guiid%
Return