Kinda? As in, imagining "nice" things is very subjective.
The last thing I imagined that cheered me up was slowly freezing to death in the snow on a street corner. It felt nice, and it cheered me up, in a way, but not sure if that's really the kind of thing you are asking tbh.
it counts for me lol i mostly cannot make myself feel better by imagining anything at all regardless of the content
gonna see if i can slowly improve tho