1st, sometimes 1x1 bricks are needed.
2nd, using macro lags and makes it boring, building slowly makes it a much funner time, 'coz macro makes it go so fast you're done in two secs. It takes away the fun.
3rd, for walls, 2x2's and 2x4's are half and half in the rarity 'coz they take up alot of space around the baseplate, and it will get a bit non-spacious. Also, if you're gonna do brick pat', 1x2, 2x4, 9x16 (lol) and so on are prefect because the first or second number is half the opposing.
4th, saving helps, 'coz if you liked something before you added some bricks, you can just load it back. Best to save it as (Name)Backup_*Number*. Example: HouseBackup_4
It helps alot.
5th and finally, if you're gonna put in lights, get the light packs and use dim, ambient and so on. The player light is too bright.
These are my tips. :3