I've been working on putting together a setup for a potential garter with a exo terra about the size of a five gal tank.
I have setup this tiny exo terra with reptile carpet, some resin ornaments and a glass dish.
Using this setup will depend on big the potential garter will be. If I end up with a bigger one, I will just move the contents of this tiny exo terra to a larger tank( I have many potential tanks with screen lids to use in sizes ranging from five gal up to fifty five gal).

For heating I could go with a heating lamp or I could use a heating mat. I do not yet have a thermostat and I read heating pads must be combined with a thermostat which is an item I don't know much about.
I think I would be inclined to use a heating pad since I have two small ones around new in packages that I got with ten gal reptile kits and never used.

Will take a pic a bit later.