One of my tanks has a file cabinet as a stand. Previously I used a mini credenza with a shelf and sliding doors, very heavy duty used from an office, made from solid oak.
The old office wood credenzas or Steelcase ones are amazingly strong and well built. Easy to paint, but I would suggest coating with an outdoor Thompsons water seal or maybe even outdoor paint to deal with the water, there are tints for the stains too. Because my mini credenza got minor water damage.
My utility closet has the furnace in it and in one corner I have one of those cheap metal garage utility shelves I have it separated with little plastic containers for different stuff. Also I haven't done it yet but I am going to get the big hooks to hang bikes and electric cords and hang the buckets from a side 2x4 and the python from the ceiling, and use one of those jumbo home depot type velcro cord wraps to hold it together. Also use the tank stands to store tank specific items in, but I use the drawers the most.
Really like the thread topic, good to get new tips.
Probably not especially useful, but here is the tank with the file cabinet.