I found a desert temple maybe 100-150 blocks away from my spawn once. This was on a vanilla generation but cool none-the-less. I made the top section an enchanting room, the middle section my main quarters, below it an underground farm (after a bit of excavating) and a shaft that leaded directly to a strip-mine. That then led to a couple of ravines and mineshafts which I made a small fortune out of. Oh, and there was a regular village + jungle biome just out of render distance from that spot. Honestly, the best starting position I have yet to see.
Never seen a jungle temple though.