Synth/sampler hybrid instruments can be really inspiring when you explore resampling. Synthesise an oscillator, render the result to audio, then reimport the file back into your synth for further mangling. Rinse and repeat!
If your instrument supports sample import and osc-to-osc FM, use complex field recordings or sampled waveforms to modulate the frequency of a synthesised oscillator.
Channel an ’80s synthesist and combine synthetic oscillators with sampled layers. Ie, use a plucky sampled attack layer to bolster a simple bass tone for the ultimate in synthetic punch.
Power-packed synths like the ones seen in this very feature often include flexible routing options. Try running signals through parallel filters, distorting at the start or end of the signal path, and routing different oscillators in different ways.