I've been through it and all around the fringes, but never to the higher locations. That's because surprisingly the high country is often inaccessible except in the warm season due to road conditions. I'm typically there in late fall (November or later) and early spring (March).
In the hills along the fringes, especially to the north, and even out of the park itself along Hwy 50 life and photography can get interesting. It's very stark country highlighted by brushy draws and old manmade structures and cottonwoods here and there to use as focal points in broad landscapes. One of my favorite photos features a herd of about 1000 sheep being moved the old fashioned way- dogs, men on foot and horseback, and horsedrawn herders wagons- through rolling stark hills in late afternoon light toward a winding yellow strip of vegetation and ancient corral in a creek bottom. The herd is a long winding "river" of animals conforming to the landscape and trailing dust, and it works quite well as counterpoint to the colorful creek. There's wildlife too, which can perform the same function. Another favorite photo is an elk herd seen small but clearly recognizable against the snow in the same sort of terrain. Both photos are stark, but made really interesting by the "breaks" in the patterns of the landscape.
Overall, it's a long ways between locations and services, and often quite deserted. If you like open country and great horizons, whether stark deserts, foothills or mountains, it will be good country for you. That's what I happen to like.
