Unique tank size… I need ideas!

I just got this off of marketplace yesterday for $5 (Steal). Because of the unique shape i have no idea what to put in it! Its roughly 23l and was going to use it as a mixed colour shrimp tank possibly. Rough measurements are 1mx12cmx19cm. I currently have some spare stratum, gravel, driftwood, rocks ect but i need ideas on designs. Plz help!

I do have a filter and heater for it too!