I was referring to the chromed steel caps from Sugino, similar to the Stronglight Auchen posted above.
But those chromed crank bolts are pretty though.

The caps serve a purpose for the non-racer. Besides keeping the threads clean and dirt out of there, in case the bolts/nuts back out from a botched install, the caps prevent you from losing them down the road, in the middle of nowhere.

Where ever I can, I do switch over to the newer 8mm hex bolts. I rather deal with my long shank Shimano 8mm crank key, than searching for my thin-walled sockets and ratchet.

I do like the suggestion from Bianchigirll for self-extractors. Used to have one on my 600 EX crank, held up well. The aftermarket new ones are nicer with bigger 8mm bolts.
I installed one on a new crank for a daily rider. I think any tourer would benefit from such a retrofit. Fewer tools to pack for that long road trip.