Until I was lucky enough to find a stash of really cool looking Supertanium bolts, I was using the titanium aircraft bolts with the thin head. I have several 1/4" bolts that I am no longer and would be willing to sell for a very reasonable price if someone wants them - I have a couple of different lengths. They look very old school because of the color. Here is a link to some for sale on ebay - by changing the suffix on the P/N, you can get different lengths:
Titanium 1 4" Bolts NAS6404 15 An Aircraft Aviation Hardware Bolt Racecare NAS | eBay
Here is a picture of my original Enots cap with the titanium bolts: