Like I said, there's very few things open on Sundays. However, you can always count on things being open in the Marais (for the most part). I dropped by Boulangerie Malineau while in the area and couldn't help but buy one of their many different sables (shortbread cookies aka lotsa butter).
I've read good things about their checkerboard sables, and how could you not want to try something so colorful?
I got the sable au chocolat pistache. The thing is huuuuuge. I can't decide if I actually liked it. All I know is that I couldn't stop eating it. As much as I say I eat everything in front of me (which is usually the case), if I don't like something, I won't eat it. Yet curiously, I kept eating this...I don't think sables are my thing but if I had to eat one, I'd pick this one.
And yes, I went to Laduree and Malineau the same day. And ate those pastries, macarons and that cookie the same day. Go me. Salad next week.