In case you didn't already know, etsy is a website for merchants to sell stuff but it has more of a homemade arts and crafts angle, rather than places like ebay.

I got bored and searched for dreamcast items, here are some I found:

Dreamcast controller "desk mate": This is a DC controller that has been completely gutted. You can put it on your desk and use it to hold pencils, paperclips, etc
This item is unavailable

Expensive dreamcast pictures to hang on the wall: This merchant is a photographer who among other things, has photographed a dreamcast controller from various angles, and a VMU (in different pictures). That's all well and good, but $99?
This item is unavailable

How about some dreamcast controller cuff links?
Etsy :: Your place to buy and sell all things handmade

Or maybe a ring? (earrings and tie clip also available from same merchant)
Etsy :: Your place to buy and sell all things handmade