Colour Flash

here's the complete example code

Graphics 800,600,32,3
;create the buffers
buffer1=CreateImage(800,600):MaskImage buffer1,0,0,255
buffer2=CreateImage(800,600):MaskImage buffer2,0,0,0
;create the grid
	SetBuffer(ImageBuffer(buffer1))
	Color 0,0,255
	For x=0 To 800 Step 16
		Line x,0,x,600
		Line 0,x,800,x
	Next
Repeat
    Text Rand(800),Rand(600),"just a test"
	SetBuffer ImageBuffer(buffer2)
	ClsColor Rand(255),Rand(255),Rand(255)
	Cls
	DrawImage buffer1,0,0
	SetBuffer FrontBuffer()
	DrawImage buffer2,0,0
	Flip
Until KeyDown(1)

hope you like :)