Hi! How to have more CE tamplates? As far as I know it is not possible to have more CE tempaltes.
Maybe some help this approach. CE tamplates based on css class.
First copy the desired ce template in your temaplates folder.
For example we will use ce_image template.
In admin create a image content element and fill in css fild with some class name (e.g. my_pic).
And edit Your ce_image template something like this:

Code:
<?php if (strpos($this->class, 'my_pic') !== false): ?>

<div>This is My simple CE IMAGE TEMPLATE, for my_pic class: 
[img]<?php echo $this->src; ?>[/img]imgSize; ?> alt="<?php echo $this->alt; ?>"/></div>

<?php else: ?>
        <div class="<?php echo $this->class; ?> block"<?php echo $this->cssID; ?><?php if ($this->style): ?> style="<?php echo $this->style; ?>"<?php endif; ?>>
<?php if ($this->headline): ?>

        <<?php echo $this->hl; ?>><?php echo $this->headline; ?></<?php echo $this->hl; ?>>
    <?php endif; ?>

<div class="image_container"<?php if ($this->margin): ?> style="<?php echo $this->margin; ?>"<?php endif; ?>>
    <?php if ($this->href): ?>
<a href="<?php echo $this->href; ?>"<?php echo $this->attributes; ?> title="<?php echo $this->alt; ?>">
<?php endif; ?>
    [img]<?php echo $this->src; ?>[/img]imgSize; ?> alt="<?php echo $this->alt; ?>"/>
    <?php if ($this->href): ?>
</a>
<?php endif; ?>
    <?php if ($this->caption): ?>
    <div class="caption"><?php echo $this->caption; ?></div>
    <?php endif; ?>
</div>

</div>
<?php endif; ?>
In similar way (if/elseif/else...), You can add as You like new temapltes by class.