Thanks for all of the input, there are some interesting ideas here. Here are some initial thoughts...
Fix & Sell/Parting-Out cars - This has crossed my mind many times but the logistics of transporting non-running/unlicensed cars is a bit of a drawback. I don't own a dolly or trailer so I would have to rent/borrow. I'd likely jump on the right opportunity.
Buy & Re-sell - This has always intrigued me. Never considered the off-lease computer flipping but that sounds interesting. Does anyone have any experience buying from auctions/garage sales for the sole purpose of re-selling?
Car Repairs - I generally do all my own repairs and have certainly helped others many times but I've always felt nervous about liability when doing someone else's brakes for example. Not sure I want to put myself in that position. It's also not always enjoyable doing car repair jobs here in the winter (I'm in Canada, eh!) as my garage isn't heated.
Handyman - This is something I have done in the past a little. I can se this working. Someone made the comment about everything needs to be cash only. I get that. I have a couple people who would likely have ongoing handyman work for me but both are self employed and would be looking for receipts in order claim the work as a business expense. Not sure I want to get into that.
Car Project Manager - Ironically I am a Project Manager only in the property development world. I never thought about applying that experience to car renovation projects. I need to give this some thought. Thanks for the suggestion...this would never have crossed my mind!
Garage Art - This is a cool idea. I think there is a market for it but I think for me it would require a little too much advertising and marketing at this point in order to make it a viable business.
Freelance Writing - This is really, really appealing to me. I have had the opportunity in the past to write a few articles for a fairly large ATV magazine. I know the owner and he was kind of enough to include a few submissions along with one cover story on buying a used ATV (which is not my area of expertise but with a little research it ended up going well). Payment for those articles however was nothing more than kickbacks from manufacturers passed on to me. I did make a few dollars doing an article once where I interviewed a stock car driver which was an interesting experience. I would love to pursue this but I'm at a bit of a loss as to where to find the opportunities or if there even are any in my area. Any input on how to go about this?
Refereeing - Both my boys play hockey and I'm the trainer for my oldest son's team. I've transitioned into that role well but I'm not sure I have enough knowledge or expertise to be an official.
Motorcycle Parts - As a motorcyclist the thought of working in that industry is definitely appealing. As I mentioned before though, I'm not really looking to spend all my effort and time building a business, generating a little cash flow is the goal. Flipping bikes has always been appealing and they certainly take up less space. I'm wondering whether there are opportunities to flip dirt-bikes, quads and even snowmobiles more easily than road bikes.
Sorry for being so long-winded. I really appreciate everyone's input though and would be interested in hearing more.