So, for those few who get the army done to their satisfaction, and wish to continue, there is another level of dementia to descend into. This would be adding such non-combatant or not totally necessary models to the army such as themed terrain, themed models, elaborate movement trays, army display boards, objective markers and so on. Producing most of these models means you have already achieved the glorious objective, the painted army.
Personally I love all this kind of paraphernalia, as it adds character to the army. I recently had the fortune to see a really excellent Goblin army with plenty of odd bits and bobs. There were some great themed models, such as a chariot (or was it a pump-wagon) on an actual spring, so it wobbled when moved, and a fanatic whose base concealed a battery so, you guessed it, you could make him spin!
Other models I've seen in this vein recently have been Retroalias' objective marker from The Magnificent Bastards blog. From the same blog,