Oh, anything about self sufficiency and sustainability, whatever you've got up your sleeves. Are you into Spirulina at all? ;-) Okay, just being cheeky, but please, by all means, whatever plucks the strings of passion. Oh, sustainable toilets of any kind! And companionship: between plant species, animal species, plants and animals... guilds, up to whole ecosystems.
Hahahaha sorry, as you can see, I'm not so good at making specific requests.