Currently we don't have custom paper sizes for Newsletter Templates. One workaround is to use the current file and make any changes you need. Once you're done, save it as a PDF, and then print the PDF on your Tabloid 11x17 printer and scale the content to fit the page.
The added benefit is you don't have to try and scale all the content, as it will do that for you when printing. That works for any Word document you're using that isn't as big as you'd like :)
I co-own and operate a small assisted living home in Pittsfield, NH (U.S.A.). We consistently seek ways to improve upon our senior activity program, providing a diversified balance of a purposeful and enjoyable time of recreation, crafting, exercise and others to reach all of our residents. I must say, it's been a challenge. This past October I began researching options online and came across your site, subscribing for a year to see what you were all about. Let me tell you, you have not disappointed! Your site is a priceless resource that we are extremely thankful for. We find a significant increase in resident participation and look forward to the new ideas that each month brings. Our residents love the changes!