Not sure if you're looking for alternative routines, but my DS1 did three naps still at 6mo, but only one was long. His day looked something like this...
WU/E 7am
Nap 1 9:45-10:15am
E 11am
Nap 2 12:15-2:15pm
E 2:30pm
Nap 3 5-5:30pm
E 6/top up 7pm
BT 7:30pm