How about a The Edge (U2) add-on pack?
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The Edge is the king of guitar effects. Many guitarists out there are paying for expensive Helix or AxeFX equipment to imitate his sound. But what if you could get his sounds with just a Spark amp? It already has the AC30, and some Edge pedals like the Rat overdrive. Now add in a shimmer effect, Korg SDD-3000, a sustainer, the ability to control delay settings with the Spark Control, and stuff like that.
The pairing of Spark and The Edge seems like a match made in heaven. I think this would sell tons of Sparks!