I have been pretty busy this week doing a lot of Photoshop work. I have to admit I am not the fastest Photoshop guru so I look for help out on the web quite often. I came across a couple of sites recently that have been helpful for both Photoshop and Inkscape.
Vecteezy offers free vectors for you to download and use.
Brusheezy offers free Photoshop brushes to download and use.
Make sure you check the license before you download. They are free but some come with restrictions, like you must contact the creator, or not for commercial work.