I did this for a 21 person tournament the other night. More people showed than were expected and I ended up using both sets worth of green and black. People thought the faux clay were the "real" chips. And yes, it was a pain separating them after.
I have this problem, my tourneys were getting bigger, and my chip addiction set in - next thing you know I have 5000+ diamond chips, 1100+ nexgens and chipcos for cash games.
Oh and 500 9 gram super diamonds as well to go with my 400 or so Marlboro chips.