I often preface my suggestions with the following phrases...

"Have you ever thought about...."
"Would you be willing to..."
"Have you ever tried.....? How did it work?"
"I'd like your thoughts on..."

Sometimes these get transparent, but people appreciate the courtesy nonetheless.

Just make sure to listen to their responses. It helps to build credibility.

__________________
Life is too short not to love and be loved....preferably multiple times in one night.

I think men talk to women so they can sleep with them and women sleep with men so they can talk to them. ~ Jay McInerney