Fond Memories Graphics does a nice job of this; there's also another company that is a little more DIY - provides slots for photos/racebib/medal...both are a little pricey, to be honest, but it's not like there's a great deal of competition out there.

Hammer a nail into the garage wall and hang them there.

All my IM and 70.3 medals are framed by the sides of a shoebox under my bed.

Google "medal tattoo" images

Saves inviting people around to brag