I’m interested in abstract and pictorial logos.
Fibonacci ratios (The Fibonacci “ratios” are 23.6%, 38.2%, 50%, 61.8%, and 100%.) preferred, simple, inspired.
Concepts could include neurons or gravity.
If you use fonts that require a license, confirm with the client they're ok with it. For licensing reasons, it is better to provide your client with information on how to acquire the font rather than providing the actual files.