I have just started posting paintings on the Daily Paintworks auctions.
I have been taking part in the latest '30 in 30' challenge which due to time constraints means I'm just doing small paintings, but the impetus to paint everyday has given me a ton of ideas to tackle once I'm finished with 30 in 30 challenge. It has given me lots of ideas for larger paintings.
The 30 in 30 challenge also means that if I mess up or I'm not happy with a painting, I'm still posting it to my blog and writing about what I learned in the process (I won't be auctioning those). I have found it is a great way to toss your insecurities aside and just have go. So if it's not a masterpiece today, then maybe one day, the idea will be!
I keep a regular notebook / sketchbook too to write down ideas when I have them.