Garden Treasure Peony has large golden yellow double flowers with soft red centers. http://www.gardenia.net/plant/paeonia-garden-treasure-itoh-peony
@Petronius that peony is gorgeous! I have a yellow Itoh peony too: Bartzella. It has only recently achieved blooming size. I bought it on the cheap from one of those big box stores. The Itoh's are VERY expensive otherwise.
I found a photo of Bartzella from last year. Only one flower, but hey, she's gathering her strength. I' ll she'll bloom up a storm in future years! D---m, too large to upload!