Graphics are an excellent way to catch people's eyes and getting your book off the shelf or the amazon store and into people's hands.
While it might be meaningful or cute do your own cover...it can bring less than wanted results. I love to design. However when it came to designing my own covers I really struggled with what I wanted and finding it, so I decided to take that control out of my hands and hand it to someone else. That was one of the best choices I made as an author.
I love graphic design and create beautiful covers for other people but for myself all I did was drive myself up walls and into corners. Only recently have I started doing covers for my own work for short stories, because I've been better able to grasp my feelings and control the outcome.
But as an author do yourself a favor and get the best graphics you can afford. It gives you a professional clean and wonderful look that helps you sell your book with confidence.