A colleague of mine was starting her own TpT store the other day and complained that there wasn't much clip art available that was specifically for logo design. So it got me thinking... I used to make some clip art and still had random pieces that I made for my own products before I started buying clip art. I decided to make these available for sellers that are just starting out (get it here, it's free).
If you want to know where else you can get clip art that is for logo design, I know there are a few others on TPT and there is this free tutorial by Teacher's Clipart and YouTube has one that teaches you how to make your own logo. So check them out!