I like the huge cres/dim way. You can also draw it out a little with a ritard/rall.
I think sometimes that cold, exact (boring) way is necessary to work out lumps and work on control.
Playing scales leigero (I can't spell it?!!!) is nice -- light and quick.
I've also had fun "improvising" on scales -- playing the same old scale routine (notes and rhythm, up/down 4 8ves in 16ths), but varying the expression -- sometimes big and loud, sometimes quiet and meek, sometimes playful with accents on the fourth 16th, sometimes slow and legato, etc.
Or you can take a scale and play patterns over it, esp finger patterns that are used in the scale -- those same finger patterns can help you play the scale in the normal way. For example, the finger pattern 123 is found in the scale. You can take fingers 123 and play scale degrees 123, then scale degrees 234, then 345, etc. -- all with those same fingers. It's basically taking a fragment of the finger pattern and repeating it, but it's a little more pleasant for the ear to hear different notes. In this case, "musical" would mean playing something slightly different than a straight up and down 4 8ve scale. You could also do 321, 1234 or 4321 finger combinations or do something with the thumb cross-unders and cross-overs.
Depending on what you consider musical, you could play the scale in one hand and chords in the other. It's a move more toward an etude, but it's a little more interesting than straight scales.
Hope that helps.