Well they have NIN as an obscure departure from rock along with Freezepop. So why not some Rock orientated Drum & Bass? Seeing as Pendulum are now in the mainstream for being a rock band, even playing rock festivals and performing as a band rather than the usual DJ set.
I suggest: Propane Nightmares, Granite, Tempest, Showdown & Mutiny.
The reason I only included tracks off In Silico is due to the absence of lyrics in track prior to this album. Maybe Pendulum could record lyrics to those tracks. Slam with lyrics... could work?