It's the arena wall from Project Gamecabin. The inspiration for this wall was taken from my own wall, which is white and has no detail on it.
As I was drawing it, three doves flew into my wall and told me exciting things before I caused them to flee by dressing up as the Guyver and shouting things like "Bio Boost!" and "Mega Smasher".
I am very tired and have been up drawing this stuff for 12 hours.