Altars
Ok, so there you have it, a crude example of an altar. Well, what is an altar? In Wicca, the altar is general the focal point of magick, and religious gatherings. In most cases, that altar stand in a consecrated circle, The temple of a magick practioner if you will. Although each tradition has its own altar guide lines, the most common items found on an altar include:
candles,
censer,
god/goddess figure,
pentacle,
scourge,
cords,
athame,
sword,
wand,
salt,
water,
chalice
Many witches only perform magick at an altar. Remember- an altar doesn't need to be perminent, but certainly can be. It can be inside, outside, round, rectangular, use you imagination.
Altar Design
Many solitaries use the folowing layout for their altars, dividing it into sections  as to what they represent.

                                         |                                                                   |
                                         |                                                                   |
                                         |                                                                   |
Goddess                                                             both                                                              God
                                         |                                                                   |                                                                                          |                                                                   |                                                                                          |                                                                   |

Keeping that in mind, here is an example altar with sample tool on it. This is more of a simple out-in-the-open altar design which is great for keeping on a nightstand.

Goddess candle                                                                                                           God candle


Bowl of water                                                 White Candle                                         Bowl of salt

                                                                         Pentacle          
                                                                          Incense


Bell                                                                                                                                    Wand       

Of course, Sabbat and  other ritual altars are more complicated.