I framed a large dung beetle (bout the size of a cadburys cream egg) myself a few years back, I bought a box frame that had some kind of generic picture in it, opened it up, removed the existing pic, glued down some cream coloured linen type curtain material as a backing and then glued my beetle down onto it. Closed the whole thing back up and it looked great! Beetle still in place 4 years later.
At the time I got the box frame in Banana Tree - but Im sure youd find similiar in many places that sell frames.