A few years ago I created some custom Buddhist vector logos for some CD covers. The CDs would hold talks by Bikkhu Bodhi, an American monk who is famous in the Theravada Buddhist traditions in authoring and teaching. Here's an example of a CD cover:
These vector logos were created using the free and open-source software Inkscape, and are available under a CC-BY-SA 4.0 license. Using Inkscape, you can open the logos, change their colours, and resize them and change them for any format, such as PNG.
Here is the first logo below. It's the typical prayer symbol of most religions, combined with the silhouette of a Stupa. A Stupa is quite a prominent Buddhist architectural style that basically came from the design of a ancient tombstone. If you think about it, it's quite creepy.
The second logo sports one of the typical hand positions for meditation, and the Bodhi leaf comes from the Bodhi tree, a significant tree for Buddhists. The Bodhi tree has the botanical name Ficus religiosa, and this means it's essentially a Fig tree. Like most Fig trees, it has formed a symbiotic relationship with a single species of wasp, and this particular wasp species helps pollinate the tree exclusively. Unlike most fig trees, it doesn't have the telltale V-shaped vein at the base of each leaf. Odd.
The third logo if a typical person meditating. Nothing fancy here.
If you like these logos, you may also be interested in Practical Abhidhamma, a free online introductory book about the Abhidhamma, a Buddhist concept.