Can I market something that I modded? It has legos and the flash drive chip of a sandisk flash drive.?

It may be perfectly legal, but it could be complicated. Rachel from freshlysqueezedflash.com modded a flash drive into a PEZ dispenser. Apparently, she looked it up and it was legal, but she got a cease and desist order from PEZ company. She decided not to take them to court because it would be too expensive to fight a large company, and they may be a gray area. See her full expanation http://www.freshlysqueezedflash.com/store/page29/page29.html