We used these sort of composition books for our lab reports.
at Sonlight
Grades 2-4
Discover & Do Level 2 DVD
In Discover & Do, Level 2, you'll observe more than 75 different experiments that are part of Sonlight's Science 2 curriculum. Not only that, you'll learn how to do the experiments yourself... in the comfort of your own home! You'll learn how to make a flashing lighthouse, why electricity and water don't mix, why you get dizzy, and how to take your own fingerprints. You'll make your own thermometer, complete a circuit, create a model lung, and much more.
Lab Resources
This area is rather new although parts of it are old. I opened it to share my new grade-keeper/grader 12-16 Lab WU.
12-16 Lab WU
12-16 Lab Wu is a flexible XLS grade keeper that includes a version of my composition grader, Lab WU [Lab Write-Up]. 12-16 is designed for co-op lab science classes that have 12 students or less and are using a plan based on 16 sections of work, such as 16 chapters, or in the case of Apologia science, 16 modules. 12-16 averages grades in quarters and semesters and yields a final grade for the year.
My Latest Lab Sheets
[I'll work on this later]

Lab Contents
Grades 3 and Up
Introduction to Biology