Place the milk chocolate in a microwave safe bowl. Melt according to package directions. Or, microwave in 30 second increments stirring after each interval. Once melted dip Ritz crackers into the chocolate. Flip cracker until coated. Tap off the excess chocolate.
Place the chocolate covered cracker on a piece of wax paper. Let set.
Once the milk chocolate has set, melt the almond bark (or white chocolate). Place the white chocolate into a piping bag. Grab the smallest decorating tip you own, and pipe spider web designs on each of the crackers. Alternatively, you can place the white chocolate in a Ziplock bag and cut the corner off. This works nicely too.
1 oz of chocolate will cover 4 Ritz crackers. If you want to make more than 12 crackers, melt more chocolate.