Depends entirely on how its done. I think most of the stuff sold at the big chain stores is down right hideous but if someone with some scale modeling skill tried their hand at it the results might look good. A lot of the times its the scale. The doodad is so huge it overpowers everything else in the tank, or you've got multiple items in the tank none of which is in scale and it just looks bizzare. They tend to be more forgivable in natural terrain as well.
I'm planning on a betta tank for either my home office or my work desk and yes, I fully intend to buy a resin T-Rex skull for it.
I'm planning on a betta tank for either my home office or my work desk and yes, I fully intend to buy a resin T-Rex skull for it.