I love the mouse and rat pictures everyone! It makes me miss my ratties sooo much! I used to have them in a cage about the size of the one that Bombalurina shows in her top image.
I am thinking about getting rodents again soon, but I am thinking about going with mice since (I know this sounds bad) I won't have the time I feel that rats deserve. My rats were very domesticated and constantly craved the attention of their loving caregiver. While I miss that, I do not have that kind of time since I work a lot.