The books below are all "Read Aloud" Picture Books with Buddhist themes and topics. Some are clearly Buddhist and even Buddhist titled. Others are simply those that exemplify the themes.
Berenstain, Stan and Jan. Berenstain Bears: New Neighbors (Acceptance)
Berenstain, Stan and Jan. Berenstain Bears: Sitter (Acceptance)
Berenstain, Stan and Jan. Berenstain Bears: Trick or Treat (Acceptance)
Burges, Laura. Buddhist Stories for Kids (Jataka Tales, Kindness, Friendship)
Nagaraja, Dharmachari. Buddha at Bedtime: Tales of Love and Wisdom (Jataka Tales)
Galliez, Roxanne. Thank You, Miyuki (Meditation)
Gorman, Amanda. Change Sings (Impermanence)
Gorman, Amanda. Something Someday (Self-Respect)
Griffith Burke, Emily. Buddhism for Kids (Meditation, Stories, Activities)
Hische, Jessica. Tomorrow I'll Be Kind (Kindness, Respect for Others)
Holt, Henry. The Empty Pot (Self-Respect, Honesty, Sincerity)
Horning, Sandra. The Giant Hug (Compassion)
Meade, Holly. If I Never Forever Endeavor (Self-Respect)
Muth, Jon. Zen Happiness (Happiness, Mindfulness)
Muth, Jon. Zen Shorts: A Stillwater and Friends Book (Mindfulness, Selfless Giving)
Muth, Jon. Zen Ties (Compassion, Friendship)
Myers, Tim. Tanuki's Gift (Friendship)
Rockwell, Anne. The Prince that Ran Away (History of the Historical Buddha)
Rosewood, Olivia. Gratitude Soup (Thankfulness)
Shultz, Charles. Happiness is a Warm Puppy (Gratitude)
Sheehan, Monica. Be Happy (Thankfulness)
Hanh, Thich Nhat. Where is the Buddha? (History of Buddhism)
Wood, Douglass. The Secret of Saying Thanks (Gratitude)
Yamada, Kobi. Feeling Grateful (Gratitude)
Hughes, Eli. Discovering Buddhism (Illustrated, Basic Buddhism)
Candradasa. Buddhism for Teens (Collection of activities, meditations and stories for calming)
Winston, Diana. Wide Awake (Introduction to Buddhism)
Metcalf, Franz and Monk Song Yonk. Buddha in Your Backpack: Everyday Buddhism for Teens (Getting Teens to relate to the Buddha)