Excellent thread idea, PO! Look forward to seeing what tasty morsels emerge from it. And in honour of its inception I just listened to the Ibert flute concerto which seems rather butterfly-like in the first and last movements, with an attractive tendresse in the middle movement, which was the one I preferred.
Also listened to 3 Pieces Breves, as recommended above, again whimsical, but I felt there was a tad more Stravinskian bite and humour to the whimsy than in the concerto, which made it more interesting to me. I suspect his smaller scale works might engage me most, but may try the Symphonie Marine too.