Even this looks pretty simple, I've spend pretty much time in this actually.
The goal of this enhancement is to make pickups fit the atmosphere of any particular map better (by rendering the skybox or any envmap-entity on the mesh). For most maps, the skybox matters a lot for which expression the atmosphere gives players, so that's why it would be a logical choice.
All pickups (except health and armour) are using bump-mapped skins with masks modified for envmap-rendering. The teleporter has been replaced for and old but enhanced cube teleporter, as it displays envmaps better (the inside is just flat, which supports envmap-entities because of that) and Sauerbraten's original teleporter is copyrighted.
There are some doors included which are also polished a bit, but those are actually just an experiment (it still creates some nice atmosphere when an envmap-entity is in the same room as the door).
The health model isn't included, as using a bump-mapped skin somehow blackens the upside of the model. The armours aren't included because envmapping them has no reason at all (too much polygons to see any clear environmental-mapped rendering) and bump-mapping the skin isn't showing much difference at all.
This is a replacement of the current and original models. If your not satisfied with the result, there is a folder called "default" which contains all files which were overwritten (so beware, any new file of this content keeps existing!).
The flags are currently carrying environmental-mapped rendering, even it's also just an experiment (not recommended to add).
To let bump-mapped skin of the carrot work; delete the original mesh (called "tris.md2"). Trust me, it's worth it.
This pickup-mod is meant to keep as much models which are currently in the official release as possible (as reason not to change anything to the current gameplay intentionally).
All modifications to masks, meshes, skins, etc are licensed as BY-NC-SA, else they are copyrighted by it's original author.
I hope you enjoy them, any constructive comment is welcome.