Pastiches rhymes with:
felicia's, alicia's, ashes, backlashes, backslashes, blushes, brainwashes, bushes, creches, croatia's, demolishes, dishes, embellishes, enmeshes, felicia's, fishes, flourishes, fuchsias, furbishes, furnishes, galoshes, garnishes, gashes, hamlisch's, hashes, impoverishes, katyushas, koresh's, lavishes, marcia's, marshes, matias, mattias, militia's, militias, natasha's, newsflashes, niclaneshia's, nourishes, osha's, porsche's, publishes, punishes, pushes, relishes, rushes, russia's, scotia's, smoshes, splashes, thrushes, tricia's, trisha's, varnishes, wabash's, whiplashes
Pastiches sounds like:
packets, packwood's, pact's, pacts, pagoda's, pagodas, pas-de-deux, pastas, pastes, pastiche, pasts, pectic, pesetas, pestka, pests, phagocytes, physicists, piaget's, pickets, pickett's, picts, pistachio, pistachios, pockets, posits, post's, post-attack, postage, postdates, posts, psychotic, pussycats