l would like to flag up the blog of Danny Gregory who is an inspiration to anyone with self-doubt about their creativeness and has written some great books, one which l have is 'Everyday Matters'. He encourages people to observe and draw in their daily doings and journalling. If you're feeling jaded or tired with the commercial pursuit of creativeness, his outlook and perspective will certainly revive that essential innate love of drawing.
Well worth a visit and the site has a wealth of archived posts and attracts many comments.