This is a unique blog idea. Make a blog all about ideas. This would be your platform to share those creative and innovative topics bubbling in your mind. There are very few blogs offering ideas and yours will be an attention grabber.
Your audience will be those looking for ideas to build something or do things differently. This can be a multi-niche blog and you can share ideas/tips across categories. There is an option to make it a multi-author blog inviting guest posts from others looking for a platform to share ideas.
Do include articles guiding brainstorming techniques and strategies for turning those big ideas into reality. You may offer services on bringing to life the ideas related to your fields of interest.
Blog Name Idea: IdeasWhiteboard.com