Have you tested what attractive icons can do to conversion rates? I have. Suffice it to say that "free" is the last thing I need in an icon set, because whether they cost $25 or $500 if you use them well on an actual business you'll recoup the costs very, very quickly. (The difference between the stock Java icon set and one which was more appropriate to my users was 100% back in 2006. If for some reason you're using signup or download text links instead of buttons drop what you were planning to do today and make yourself a big,　obvious button.)