Blackberry Blossom is right up there towards the top of the heap of fiddle tunes that are way overplayed. Love it or hate it here is an example of it.
The trick to making this tune sound like a musical performance as opposed to an exercise is to give it a bit of that shoulder-shrugging fiddle bounce. None the less it's a good exercise in alternate picking.

This video runs through the melody twice, once fast and once slow, followed up by an example of one possible chord progression that could be played behind it.