I love candy, but it can add up when you're on a super tight budget. Cake mixes are about as inexpensive as you can go. Even when they aren't on sale, they're between $1 and $1.30 here, and they make treats for a lot of people. I've used chocolate and white ones over the years to make cupcakes, cookies (just add an egg and 1 stick of melted butter and a tiny amount of water to make it a cookie mix), mini heart shaped cakes, etc. I haven't yet tried cake pops, but you could use them for that.
Dust them with powdered sugar or make a very inexpensive and super easy frosting by adding a tiny amount of liquid to powdered sugar and stir until it is the consistency of frosting. The liquid can be flavoring/coloring with extra water if needed. A little goes a long way with powdered sugar, so start with a few drops and add more as needed. Almond extract is very nice and clear. Vanilla tastes yummy but tends to color the frosting brownish. You can use smushed berries (with seeds removed) or fruit juice for natural coloring & flavoring if you want. If you add more liquid you can make a pretty glaze.
A package of doilies is usually very inexpensive and they can be used on little red paper plates to give out the treats or to make Valentines on red paper.
You can also place a doily over a cake or cookie and lightly dust it with powdered sugar or cocoa and then remove the doily for a very pretty design. I've had the most success using a fine sieve and a spoon to push the sugar through.
"...for the happy heart, life is a continual feast. Better to have little, with fear for the Lord, than to have great treasure and inner turmoil." Proverbs 15:15b-16 NLT
The pessimist sees difficulty in every opportunity. The optimist sees the opportunity in every difficulty.--Winston Churchill