Depends where you're thinking of basing yourself. If it's Fife, then you've got St Andrews (adjacent to bus station), Glenrothes, Dunfermline (St Leonards St opp Asda superstore) and Cowdenbeath (Broad Street on way out of town to Hill of Beath - a former tram depot). There's also the small outbase at Newburgh (The Shore) where 4/5 deckers park at night next to the old depot building.
Alternatively, if it's more central, then you're talking about Larbert (Stirling Road on edge of Falkirk), Bannockburn (corner of Cowie Road - on the very edge of town with fields around).
However, the best place is Balfron. On the C10/11 service (I think) from Stirling to Glasgow. The village is in the hills, middle of nowhere. The depot gets the real old timers, and being mainly on schools, it sits there throughout the day. Last time I was there (earlier this year) it had ex Bristol Leyland Olympians, ex Glasgow Volvo Olympians, ex York Scania L113, ex Manchester L94, ex London Dart - right mix. Depot there is towards the bottom of the village, turn left in Dunmore Street and it's just there.
Hope this helps