>>"How do I get actual blocks into my tool palette bars, instead of the samples?"
The answer is: DRAG&DROP Blockreferences or Files, which are designed for using "as Block" definition.
>>"I am using AutoCAD Symbols 200 now, from my design center."
If you have drawing files with blocks, it is possible to create ToolPalette Tools via DesignCenter: DC ->on Block section of a file -> on the right: RightClick -> Create ToolPalettes
NOTE: ToolPalettes DO NOT contain blocks, you just create a button with the information to insert a block(or file) FROM....<c:\just a linik to your source file>
so it is important to think twice from where you add the blocks/files - these files are not part of a "Export settings" or "migration from previous version" action.