"We all know that Uncle Owen and Aunt Beru were executed in Episode 4 (A New Hope) - and the grizzly revolution was pivotal in convincing Luke to begin his heroic journey. We didn't see actual the event - and we didn't need to (especially in a 'kids' movie) - but I thought it would be cool to imagine how it might have played out... especially if it had introduced us to Boba Fett's character!"
"There was a scene filmed for Empire Strikes Back that featured a Wampa that R2-D2 and C-3PO locked in a room at Echo Base being discovered by Snowtroopers... that scene wasn't completed because of the limitations of the animatics for the Wampa. So what I've done here is imagined how - if they'd been able to produce a better looking Wampa - they could have used it to (temporarily) terrorize the advancing Imperials!"
"There was a scene filmed, but not completed, for Return of the Jedi (apparently as a joke) - showing the Imperial Guard using their force pikes to execute Moff Jerjerrod for slacking with his job of building the second Death Star. I thought that scene, if it had been used, could have actually been important in demonstrating Darth Vader's wavering devotion to his Emperor. The way I imagine it - the Emperor orders his guards to execute the hapless Moff - but Vader actually protests - and tries to remind the Emperor that this was a loyal soldier who delivered a functional Death Star. I think this would be consistent with Vader's old appreciation, as Anakin, for his troops - and would start to sow the seeds for his eventual redemption at the end of the movie!"
I particularly like the idea behind the last one - I think that would have worked really well in the movie actually. You can see more of Shane's work at the link below.