Donald Sterling Sues -- Gimme Back My Painting ... Of Me!

Today in Ridiculous Donald Sterling Lawsuits -- Donald sues over an oil painting of HIMSELF that he claims an old friend took and won't give back ... seriously.

Yup, the disgraced former L.A. Clippers owner claims his former female "friend" Maiko Maya King took several items from him in 2014 when she had access to his home ... and refuses to give them back.

Among the items ... an oil painting of Sterling, an envelope with $10,000 cash (hmmm ... ) and a hearing aid with a special battery.

Oh, and in the court docs, obtained by TMZ Sports, Sterling argues that his painting is worth ... get this ... $10,000!!!!! (Who the hell would ever pay for that?).