Many of Atiyah's papers, especially those with Bott, are truly inspiring -- not only "The Yang-Mills Equations on Riemann Surfaces" but also "The Moment Map and Equivariant Cohomology" and "Convexity and Commuting Hamiltonians." He has a knack for writing in a style that, while not rigorous, allows the reader to fill in all rigorous details, and at the same time communicates high excitement.
His textbook Introduction to Commutative Algebra, written with Macdonald, is like a volume of poetry. I would guess (from internal stylistic evidence) that it was mostly written by Macdonald, but it's all great.