wall sticker castle

My cousin loves building towers with her building blocks and for her birthday i want to get her some really huge ones like i used to have when i was 9. I bought them at walmart for $15 and the blocks were 1 and a half inches thick, almost a foot tall, and 8 and a half inched wide. They were really huge, plastick, light blue, textured, interlocking tops and bottem, some had stickers on them that made them look like a class room or a house. You could build like little walls or castles or houses with them... They were so much fun, and i want to buy some for my cousin. Where could i find those or some faily similar