All forms of the Joomla! core extensions look nice with form replacements and all other 3rd party extensions following Joomla! standards.

<form>
	<fieldset>
		<p>
			<label for="input1">Sample Input 1</label> <br />
			<input id="input1" class="inputbox" name="input" type="input" />
		</p>
		<p>
			<label for="input2">Sample Input 2</label> <br />
			<input id="input2" class="inputbox" name="input" type="input" />
		</p>
		<p>
			<input id="radio-sample" type="radio" /><label for="radio-sample">Sample Radio Input</label>
			<input id="radio-sample2" type="radio" /><label for="radio-sample2">Sample Radio Input 2</label><br />
			<input id="checkbox-sample" type="checkbox" /><label for="checkbox-sample">Sample CheckBox Input</label>
			<input id="checkbox-sample2" type="checkbox" /><label for="checkbox-sample2">Sample CheckBox Input 2</label>
		</p>
		<p>
			<label for="select">Sample Select Field:</label><br />
			<select id="select">
				<option selected="selected">Option One</option>
				<option>Option Two</option>
			</select>
		</p>
		<p>
			<label for="textarea-sample">Sample Textarea Field:</label><br />
			<textarea id="textarea-sample" class="inputbox" cols="80" rows="5">Textarea text</textarea>
		</p>
		<p>
			<button>Submit Button</button> <input class="button" type="button" value="Reset Input" />
		</p>
	</fieldset>	
</form>