Why not just say "I would appreciate any ideas?" This article and others make a good case for using the active voice. The reason for saying "would be appreciated" as opposed to "are appreciated" is that the ideas haven't come in yet.
Geeky Gadgets: 101 AI App Ideas You Can Build Without Writing Code
The Next Web: 5 cost-saving rules for startups to filter app advertising ideas to lower CPI
5 cost-saving rules for startups to filter app advertising ideas to lower CPI
Inc.com on MSN: The best iPhone apps for brainstorming and keeping your ideas organized
For decades, the process of building software has remained stubbornly complex. Entrepreneurs with promising app ideas often find themselves blocked by an all-too-familiar wall: long timelines, high ...
Cult of Mac: How to turn great iOS app ideas into something real
Complex concepts distilled into simple ideas could be described as pithy, or full of concentrated meaning. Also, one who expresses oneself in a pithy manner could be described as pithy.
The ideas I'm trying to express in this term include both the disparity of the beginning and end subjects and yet the overall lack of 'seam' or 'break' in the conversation -- each step is a natural outcropping of the previous part of the conversation.
In the same way, using "for" in ideas on improving the team means you support improving the team while using "on" doesn't necessarily mean so. It's all connotation and subconscious language use and effects.
"Ideas on" vs. "ideas for" - English Language & Usage Stack Exchange