Fran...quick tut.. 

Created a layer in photoshp. used the dropper and sneaked in the colour i wanted from the original.. played around with the adjustments..hue..saturation.. until i got close to what i wanted..

went to NASA's site.. downloaded several galaxies and star pix. Dragged images onto my blue layer.. using the screen mode to remove the black background. moved them around a bit, changed opacity etc. 

Created that world planet in bryce...layered it on .. then created the glow effect using the layers style pallete. Did that by creating a duplicate of the planet, and using the blending options in linear dodge mode.. created an inner glow. Then duplicated that layer and merging the both together.. and then putting the merged layer into linear dodge mode too, to get just the glow effect..and not the planet. Then erased the extra bit of glow i didn't want. (I cheated here..ought to have done it in byrce.. but that silly light and me.. :scared: ).. http://gallery.artofgregmartin.com/tuts_arts/making_a_planet.html explains that better. 

I used fir as the foliage on my tree in the tree lab.. that gives it that effect Used the 2D size and disperse. and a black background sky.. so when i put it in the screen mode in photoshop..the trees and the ground are the only things that showed. 

You mentioned something about the blue effect. Since I layered everything in photoshop..and used a blue background. when I screened..I get that effect and I can work in layers.. pushing and pulling the colour adjustments.

this is a quick one. if you want me to go into detail..lemme know.. 

cheers and happy brycing