Two common interest-enhancement approaches in mathematics curriculum design are illustrations and personalization of problems to students' interests. The objective of these experiments is to test a variety of illustrations and personalization approaches. In the illustrations experiment, students (N = 265) were randomly assigned to lessons with story problems containing decorative illustrations, contextual illustrations, diagrammatic illustrations, misleading illustrations, or no illustrations (only text; control). Students' problem-solving performance and attitudes were not affected by illustration condition, but learning was better in the control compared to contextual illustrations. In the personalization experiment, students (N = 223) were randomly assigned to story problems that were either personalized based on: a survey of their interests, their choice of interest topics, a randomly-assigned interest topic, or the original non-personalized story problem (control). The findings indicated there were benefits for choice personalization both for performance in the problem set as well as on a later learning assessment.