I made one of these
I like the idea, especially when catered to dealing with urges. It can be used similar to the 15 minute game. You shake it up and you can't do anything until every piece of glitter has sunk to the bottom of the jar. I didn't have any glitter glue so I just used a fair amount of PVA glue and that seems to have worked okay for mine. You can also make mini ones to take with you out and about.
If you like fish, you could put some small plastics ones in there, or decorate it especially to look like a little fish tank
Have fun!
(PS - Plus one to sealing the jar well, glitter gets everywhere!)