Did you know that Resee's Peanut Butter Cups, Plain and Peanut M&Ms are gluten-free? Along with many other candies.
Do you cook or bake? If you do, make a batch of cookies...almost all regular recipes can be made by just replacing the flour with GF All purpose flour. Chocolate Chips - I haven't found a brand that has gluten, but check the label.
Do you have a frig at work...stock some items so you have more than those orange slices at the ready. Apples, grapes, yogurt, string cheese or cheese slices, deli meat (check label) to add to those rice crackers. Add nuts or peanut butter to your stash. I have a jar on my desk with a few pnut M&Ms plus peanuts and raisins just in case it's someone's bday and cake shows up.
There are many healthy gluten free foods, but since your post is about treats at work I'll add cheetos, fritos and most regular potato chips are all gluten free.
Fibromyalgia 10/27/09 & Celiac 3/26/09
Med/Supplements: Flexeril at bedtime; Multi-Vit, B, D, Calcium, Magnesium, Malic/Acid, Fish Oil, Probiotic
Still a mystery - heat/humidity intolerance