My wife and I moved into a new house in February. The house is basically move-in ready, but one project I want to tackle is my basement. I live in Ohio and I've always had a somewhat finished basement. I especially enjoyed mine growing up and want my son to have the same memories.
So here's a few pictures:

The space is basically a big rectangle -- about 26 x 32.
In terms of use, I'm looking for a workout area, a seating area, a ping pong table, and a smaller card table.
My digging through the attic and garage indicates that the prior owners already did some work --
-Used patio paint to paint the floor
-Used masonry paint of the cinder blocks
-Started framing in a bathroom
Here is my design plan:
-Paint the ceiling dark gray or black (like this --
https://s3-production.bobvila.com/slides/21386/widened/painted_basement_rafters.jpg?1501001300)
-Paint the cinder walls a light gray (no drywall; they are basically already primed with the masonry paint)
-Paint the steal beam and poles red (Ohio State theme)
-Glue white floorboard to the base of the cinder blocks
-Add a couple floor lights (I think these lights look better in a basement)
-Use area rugs around the various areas
-Add shelves under basement steps and all along that wall
I am wondering if I am missing anything big here in terms of water/light/protecting the actual basement. My house has never had water issues (according to the disclosures), but I am extremely wary of putting drywall, carpet, or other moisture/mold holding materials.
I also think this is pretty mustachian way to fix up this area. My temporary guess is maybe $750-1,000 to freshen up this space quite a lot and add 900 square feet of living space.
I'm just starting to think about this but I'm very open to suggestions.