I am unsure wether or not they do this already but depending on certain domains you pick, can a summoning theme be available on the themes selection?
Elemental Domains: Give exactly the kind of elemental
Good: Summons palanars
Evil: Summons infernals/abyssal demons
Reptilian: Snakes already available
Animal: An improved version of the default perhaps? As well as a reduced amount of summoning points due to domain's ability.
Plants: Vines and wild life
And etc. I would like to hear peoples opinions and DM's opinions on this.
Already implemented, automatically.
However, what i would like is the Cleric domains to say if they change the summoning theme (in the mechanic explanations part of the webpage) and to what.
Before you post a suggestion, try and make sure it's not already -in the game-.
You moonhead :)