I don't think of myself as someone who likes surprises. What I love is someone else taking on a cognitive load for me, especially in areas where I am not passionate. So, I would be thrilled if someone else figured out where to hang a painting or what piece of jewelry to buy me (except I definitely didn't want an engagement ring) because I do not care about those things. On the other hand, if someone took on the cognitive load or planning a menu for me, or making educational decisions for my children or students, I would not be happy, because those are things I am passionate about.
I know from your postings that you have a very beautiful home and strong opinions about how it looks. So, it doesn't surprise me that taking the time, and collaborating with your DH to make sure it's right would be your preference.