There are literally thousands of Halloween-themed Math worksheets out there. They may seem like fun, but they are still worksheets! Here are a few non-worksheet Halloween Math activities:

http://www.weareteachers.com/4-creepy-crawly-math-activities-for-halloween/

Activities include Candy Math, Batty for Shapes, Seasonal Problem-Solving, and Halloween Estimation. Suitable for primary students, but could be adapted for older students.

http://www.educationworld.com/a_curr/mathchat/mathchat009.shtml

Describes the following activities for elementary students: Pumpkin Math, Spider Math, and Halloween Data.

http://www2.lhric.org/pocantico/taverna/04/math.htm

These are samples of Halloween word problems written by elementary students. They could be used as examples for students of all ages to write their own.

http://www.smartygames.com/igre/math/halloweenMath.html

This is a computer game students can use to practice their addition, subtraction, multiplication, or division facts.

http://www.mathwire.com/themes/themepumpkin.html#mat

The following pumpkin-themed activities are described: Math Mat, Measurement, Symmetry, Glyphs & Graphing Ideas, Math-Literature Connections, Games, and Problem Solving.

http://www.notimeforflashcards.com/2010/10/halloween-math-activities.html

These Math activities which use Halloween-themed erasers as manipulatives are geared towards younger students.

http://www.notimeforflashcards.com/2010/10/halloween-math-activities.html

These Halloween-themed Math activities use dollar-store items as manipulatives. The activities described are more suitable for students in the primary grades but could be adapted for older students.