Here's my pastel orange ghost male, Victor. (The colors in the photo aren't amazing, but they aren't too far off)
To answer your other question, if you bred a ghost to a pastel, you'd get half of the clutch being normals het for ghost (they look normal but carry 1 ghost gene) and half pastel het ghost (look like regular pastels, but carry 1 ghost gene). The same would go with for a spider to a ghost, except obviously you'd get spiders het for ghost and normals het for ghost.
Because the ghost morph is recessive, the animal needs to have 2 "copies" of the mutated gene to show the morph, but they can have a normal look and carry 1 copy of the gene and be able to pass it on to their offspring.
The above being said, if you bred a pastel or spider to a ghost, then all the babies would be het for ghost, so you could either breed 2 of the babies together or breed one baby back to the ghost parent and get some ghost babies.