i don't think theres a tool for that yet but try this tut
http://paintdotnet.forumer.com/viewtopic.php?f=15&t=21385
just replace the color wheel with something blue
@ madjik
it looks like a gateway in to something,and i think its very pretty
@ topic
this isnt any ordinary tire, its been grown to run freely with out any machine to control it,
its...
natural tire!
well it looks like a natural tire?
ah ha! now i understand he doesnt know how to put a sig... i remember one of my friends since in his lanuage theres no p so they say but bage etc...
i say flatten the image and the go to save as and change the file format to eather gif or pnd or jpeg etc....