Karen Salmansohn is a former advertising executive who reinvented herself as a guru of happiness. She marries pithy statements with bold graphics to create the inspirational flashcards that make up her “Instant Happy: 10-Second Attitude Makeovers” (Ten Speed). Salmansohn, who writes a Be Happy, Dammit newsletter, aims to banish negative thoughts and cultivate positive ones. We’ve all heard this advice before but she finds a way to make some of it feel fresh. When she writes, “View your tormentors as mentors,” and illustrates it with a company man in a test tube, you know it’s OK to have a few wicked wishes, too.