I ditched most of my foils (still am) a long time ago, and have been altering (and occassionally commissioning) to eventually have every card I played with altered. It will take a while, but it will be incredible once finished. Obviously you'd rather have more played cards if you're going to have them be made borderless or something, but to me there's not really any card I wouldn't want altered (other than misprinted/miscut stuff, which is already awesome on its own).
There are plenty of artists to comission stuff. It should be suited to what you enjoy. I'd refer you to the massive thread on MTGSalvation to start looking through that to find exampes and artists you like:
http://forums.mtgsalvation.com/showthread.php?t=93474