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You should do a quick google search, you can get lots of ideas.
I find that choosing proper size decor and good placement is key. Clustering plants together in 1 spot, leaving some nice open space and not over crowding everything. Choose 1 or 2 "items" as focal points like a cluster of plants and a hunk of driftwood.
These are some tanks I've seen that I really like and was surprised to see they were only 10 gallons