Im really into building Pc's even tho i only have enough money to mess with mine. But i just got a Dremel (complete for 8$

) And im going to get a cheap case and mess with it and try and mod it a little bit. Basically my question is: Is there any money in this? And any advice from anyone with experience in modding?
Also what are some good sites to look into for PC modding? Im looking at Xoxide and CrazyPc atm. Any other good ones? Or even sites with instructions and tips on the subject?